A city needs to increase its rubbish disposal facili-ties.

Chapter , Problem 1-61

(choose chapter or problem)

A city needs to increase its rubbish disposal facili-ties. There is a choice of two rubbish disposal areas,as follows.Area A:A gravel pit with a capacity of 16 mil-lion cubic meters. Owing to the possibility of highgroundwater, however, the Regional Water PollutionControl Board has restricted the lower 2 million cubicmeters of fill to inert material only (earth, concrete,asphalt, paving, brick, etc.). The inert material, prin-cipally clean earth, must be purchased and hauled tothis area for the bottom fill.Area B:Capacity is 14 million cubic meters. Theentire capacity may be used for general rubbish dis-posal. This area will require an average increase ina round-trip haul of 5 miles for 60% of the city, adecreased haul of 2 miles for 20% of the city. Forthe remaining 20% of the city, the haul is the samedistance as for AreaA.Assume the following conditions:Cost of inert material placed in AreaAwill be$9.40/m3.Average speed of trucks from last pickup todisposal site is 15 miles per hour.The rubbish truck and a two-man crew will cost$140 per hour. Truck capacity of 41/2tons per load or 20 m3.Sufficient cover material is available at allareas;however,inert material for the bottom fillin AreaAmust be hauled in.Which of the sites do you recommend?(Answer:AreaB)